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Moles in the equation ΔG=-nFE is for moles of electrons, so even if the moles of a substance are not explicitly given, you should be able to figure out the moles of electrons through the redox half-reactions.
Ivy Lu 1C wrote:The n in the equation is the moles of electrons transferred. To find the electrons transferred, you'll have to write the two half-reactions and balance them.
A good example of this is homework problem 14.9.a):
Given the overall equation 2 Ce4+ (aq) + 3 I- (aq) --> 2 Ce3+ (aq) + I3- (aq), the half reactions would be:
2 Ce4+ (aq) + 2 e- --> 2 Ce3+ (aq) and 3 I- (aq) --> I3- (aq) + 2 e-.
Since 2 moles of electrons are being transferred in the overall reaction, you would plug in 2 for n in the equation Delta G = -nFE
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